Debt - Schedule if Senior Unsecured Note Issued (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Long-Term Debt	$ 11,370	$ 3,768
1.450% Notes due May 15, 2017
Debt Instrument [Line Items]
Long-Term Debt	300	0
6.375% Notes due August 1, 2019
Debt Instrument [Line Items]
Long-Term Debt	802	0
3.300% Notes due March 1, 2023
Debt Instrument [Line Items]
Long-Term Debt	305	0
3.875% Notes due May 15, 2024
Debt Instrument [Line Items]
Long-Term Debt	419	0
4.875% Notes due May 15, 2044
Debt Instrument [Line Items]
Long-Term Debt	334	$ 0
Care Fusion Corporation
Debt Instrument [Line Items]
Long-Term Debt	1,949
Care Fusion Corporation | 1.450% Notes due May 15, 2017
Debt Instrument [Line Items]
Long-Term Debt	$ 293
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	97.64%
Care Fusion Corporation | 6.375% Notes due August 1, 2019
Debt Instrument [Line Items]
Long-Term Debt	$ 665
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	95.00%
Care Fusion Corporation | 3.300% Notes due March 1, 2023
Debt Instrument [Line Items]
Long-Term Debt	$ 294
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	97.95%
Care Fusion Corporation | 3.875% Notes due May 15, 2024
Debt Instrument [Line Items]
Long-Term Debt	$ 397
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	99.37%
Care Fusion Corporation | 4.875% Notes due May 15, 2044
Debt Instrument [Line Items]
Long-Term Debt	$ 300
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	99.96%